#include <thrust/iterator/retag.h>
#include <thrust/mismatch.h>

#include <unittest/unittest.h>
template <class Vector>
void TestMismatchSimple()
{
  Vector a{1, 2, 3, 4};
  Vector b{1, 2, 4, 3};

  ASSERT_EQUAL(thrust::mismatch(a.begin(), a.end(), b.begin()).first - a.begin(), 2);
  ASSERT_EQUAL(thrust::mismatch(a.begin(), a.end(), b.begin()).second - b.begin(), 2);

  b[2] = 3;

  ASSERT_EQUAL(thrust::mismatch(a.begin(), a.end(), b.begin()).first - a.begin(), 3);
  ASSERT_EQUAL(thrust::mismatch(a.begin(), a.end(), b.begin()).second - b.begin(), 3);

  b[3] = 4;

  ASSERT_EQUAL(thrust::mismatch(a.begin(), a.end(), b.begin()).first - a.begin(), 4);
  ASSERT_EQUAL(thrust::mismatch(a.begin(), a.end(), b.begin()).second - b.begin(), 4);
}
DECLARE_VECTOR_UNITTEST(TestMismatchSimple);

template <typename InputIterator1, typename InputIterator2>
cuda::std::pair<InputIterator1, InputIterator2>
mismatch(my_system& system, InputIterator1 first, InputIterator1, InputIterator2)
{
  system.validate_dispatch();
  return cuda::std::make_pair(first, first);
}

void TestMismatchDispatchExplicit()
{
  thrust::device_vector<int> vec(1);

  my_system sys(0);
  thrust::mismatch(sys, vec.begin(), vec.begin(), vec.begin());

  ASSERT_EQUAL(true, sys.is_valid());
}
DECLARE_UNITTEST(TestMismatchDispatchExplicit);

template <typename InputIterator1, typename InputIterator2>
cuda::std::pair<InputIterator1, InputIterator2> mismatch(my_tag, InputIterator1 first, InputIterator1, InputIterator2)
{
  *first = 13;
  return cuda::std::make_pair(first, first);
}

void TestMismatchDispatchImplicit()
{
  thrust::device_vector<int> vec(1);

  thrust::mismatch(
    thrust::retag<my_tag>(vec.begin()), thrust::retag<my_tag>(vec.begin()), thrust::retag<my_tag>(vec.begin()));

  ASSERT_EQUAL(13, vec.front());
}
DECLARE_UNITTEST(TestMismatchDispatchImplicit);
